Adding back the GLES3 renderer pt1. Unlike in godot it can be disable…

…d compile time. It will be enabled afer if works.

SConstruct

@@ -155,6 +155,7 @@ opts.Add(
         False,
     )
 )
+opts.Add(BoolVariable("disable_gles3", "Disable the gles3 video driver.", True))
 opts.Add(BoolVariable("disable_3d", "Disable 3D nodes for a smaller executable", False))
 opts.Add(BoolVariable("disable_advanced_gui", "Disable advanced GUI nodes and behaviors", False))
 opts.Add(BoolVariable("modules_enabled_by_default", "If no, disable all modules except ones explicitly enabled", True))
@@ -699,6 +700,9 @@ if selected_platform in platform_list:
     if env["tools"]:
         env.Append(CPPDEFINES=["TOOLS_ENABLED"])
 
+    if env["disable_gles3"]:                                                                                                                                
+        env.Append(CPPDEFINES=["GLES3_DISABLED"]) 
+
     if env["disable_3d"]:
         if env["tools"]:
             print(
@@ -709,6 +713,7 @@ if selected_platform in platform_list:
         else:
             env.Append(CPPDEFINES=["_3D_DISABLED"])
 
+
     if env["disable_advanced_gui"]:
         if env["tools"]:
             print(
@@ -725,6 +730,15 @@ if selected_platform in platform_list:
         methods.no_verbose(sys, env)
 
     if not env["platform"] == "server":
+        if not env["disable_gles3"]:
+            env.Append(
+                BUILDERS={
+                    "GLES3_GLSL": env.Builder(
+                        action=run_in_subprocess(gles_builders.build_gles3_headers), suffix="glsl.gen.h", src_suffix=".glsl"
+                    )
+                }
+            )
+
         env.Append(
             BUILDERS={
                 "GLES2_GLSL": env.Builder(

core/bind/core_bind.cpp

@@ -1596,6 +1596,9 @@ void _OS::_bind_methods() {
 	ADD_PROPERTY_DEFAULT("window_size", Vector2());
 
 	BIND_ENUM_CONSTANT(VIDEO_DRIVER_GLES2);
+#ifndef GLES3_DISABLED
+  BIND_ENUM_CONSTANT(VIDEO_DRIVER_GLES3);
+#endif
 
 	BIND_ENUM_CONSTANT(DAY_SUNDAY);
 	BIND_ENUM_CONSTANT(DAY_MONDAY);

core/bind/core_bind.h

@@ -110,6 +110,9 @@ class _OS : public Object {
 public:
 	enum VideoDriver {
 		VIDEO_DRIVER_GLES2,
+#ifndef GLES3_DISABLED
+		VIDEO_DRIVER_GLES3,
+#endif
 	};
 
 	enum PowerState {

core/os/os.cpp

@@ -879,6 +879,10 @@ const char *OS::get_video_driver_name(int p_driver) const {
 	switch (p_driver) {
 		case VIDEO_DRIVER_GLES2:
 			return "GLES2";
+#ifndef GLES3_DISABLED
+    	case VIDEO_DRIVER_GLES3:
+				return "GLES3";
+#endif
 		default:
 			return "GLES2";
 	}

core/os/os.h

@@ -196,6 +196,9 @@ class OS {
 	// This should be customizable
 	enum VideoDriver {
 		VIDEO_DRIVER_GLES2,
+#ifndef GLES3_DISABLED
+		VIDEO_DRIVER_GLES3,
+#endif
 		VIDEO_DRIVER_MAX,
 	};
 

drivers/SCsub

@@ -25,6 +25,10 @@ SConscript("winmidi/SCsub")
 # Graphics drivers
 if env["platform"] != "server":
     SConscript("gles2/SCsub")
+
+    if not env["disable_gles3"]:
+        SConscript("gles3/SCsub")
+
     SConscript("gles_common/SCsub")
     SConscript("gl_context/SCsub")
 else:

drivers/gles3/SCsub

@@ -0,0 +1,8 @@
+#!/usr/bin/env python
+
+Import("env")
+
+if not env["disable_gles3"]:
+    env.add_source_files(env.drivers_sources, "*.cpp")
+
+    SConscript("shaders/SCsub")